Concrete lining for shafts.



A. B. DOWELL.

' CONCRETE LINING FOR SHAFTS.

APPLICAT Patented Aug. 13, 1918.

ALLEN is. DOWELL, or ,s'r. :LOUIS, MISSOURI.

CONCRETE LINING FOR SHAF'IS. e

To all whom it may concern: V i

Be it known that I, ALLEN B. DOWELL, a

citizen ofthe United States, residingat St.

Louis, Missouri,have invented a certain new and useful Improvement 1n Concrete Linings for Shafts, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to a lining particularly designed for the shafts of mines and bins, or wherever a strong and su the liningis in service.

like vertical excavation, although with. inconsequential changes, lining ofmy improved construction can be economically. and

advantageously used in subways, sewers, wells, cisterns, sunken tanks, silos storage bstantial fire, water and rust-proof lining is desired. The prinicpal objects of my invention are,

to provide a lining in the form of slabs of concrete, in order that said lining will be wholly fire, water, and rust-proof andnot subject to rapid disintegration or decay, and further, to form the slabs of lining material sothat their: meeting ends will interengage bymeans of a seriesof olfset joints and shoulders, thereby forming a comparatively strong andrigid structure which will readily withstand all internally and externally applied stresses which may be applied while A further object of my invention is to provide a lining material which can be easily and cheaply manufactured and aS- sembled for use. 1

With the foregoing and other objects in view, my invention consists in certain novel features of construction and arrangement of parts,-hereinafter' more fully described and claimed, and illustrated in the accompanying drawings, in which- Figure 1 is a perspective view of a short vertical section of lining, the same being constructed in accordance with my invention;

Figs. 2 and 3 are perspective views of the slab members utilized in my improved lining, and said slabs being shown inverted or upside down; 7

Fig. 4 is a perspective view of a corner of a lining structure of my improved construction;

Fig. 5 is a detail section through portions of two of the lining members and showing Specification of Letters Patent.

Patented Aug. 13,1918.

Application filedfictober 10, 1917. Serial No. 195,696.

the construction whereby an air, and Wateroval or circular lining;

Fig. 7 is a detail section of a joint between members utilized in forming a polygonal lining.

As illustrated in the accompanylng drawings, my improved l1n1ng 1s made in the form of slabs of any desired length, breadth and thickness, said slabs being constructed of concrete or analogous hardened plastic material and when the lining material is used for substantially square or rectangular shafts, two sets of slabs are provided, one set for the sides of the shaft and another set for the ends. 1

It will be understood that the slabs are laid in courses as illustrated in Fig. 1.

The members 10 forming the slabs used at the sides of the shaft are made by pouring plastic concrete into suitable forms and prior to the pouring operations, pairs of reinforcing bars 11 are locatedyin the forms so that the resulting slab is reinforced. These bars are preferably spread apart throughout their central portions and their ends are brought together, thereby providing a construction which materially strengthens the completed slab.

- 1 The inner face of the slab 10 is cut away near both ends to form vertically disposed shoulders 12 and, formed integral with both endsof each side slab 10 andat the bottoms thereof are .oii'twardly projecting rectangular blocks 13. 1 Formed in the underface of each slab 10 is a longitudinally disposed groove 1 14 which is substantially U-shape in cross section and which is adapted to receive a comparatively small. body of cement when the slabs are laid one on top of the other, thus forming a bond between two side slabs. Formed integral with the inner face of each slab l5 and adjacent to the ends 15 is a longitudinally disposed v groove 20 which is adapted to receivea body of cement ,or the like when the slabs are properly assembled for use. y

then the slabs thus constructed are utilized for forming a substantially rectangular w lining for a shaft, they are laid in co urses as illustrated in Fig. 1 with sufficient bond- 20, .and provide air and water tight joints.

The rectangular blocks 17 on theend slabs overlie-the :rectangular blocks 13 on the side slabs and the inner vertical corners of the ends slabs fit snugly against the vertical shoulders 12 on sth'e ends of the side slabs. Portions of the inner faces of the side slabs immediately adjacent to the shoulders 12 bear directly against the faces 19 ofthe vertically disposed lugs 18 on the end slabs. Thus, the meeting ends of the slabs are united by vertically and horizontally disposedjoints, the same being disposed so as toefi'ectual'ly resist all internally and eXter- .nally applied stresses which may be applied while the lining is in service.

As illustrated in Fig. 1, vertically disposed angle bars 2l'mayfbe secured to the central portions of the side lining slabs, said angle bars serving as supports and points of "aty tachme-nt for transversely disposed rails 22,

these latter dividing the space within the lining into two vertical shafts.

Secured at suitable points on the, inner face of the end lining 'slabd are brackets or I supports for the vertically disposed cage sm es- Whenmy'improved lining is constructed for acircular or oval shaft, the joint between the ends .of two of the slabs is constructed as illustrated in Fig. 6 and when the slabs are constructed for an angular shaft, the

Copies of this patent may be obtained for llorinedin the underside of each end ,slab

joint between the meeting ends of two slabs "is" formed as illustrated in Fig. 7.

A lining of-my'improved construction can be easilyand cheaply manufactured, is fire, water and dust-proof, is not subject to rapid disintegration or decay, and therefore, is particularly applicable for use as a lining formine; shafts, wells, cisterns, sunken tanks, and likewise for subways, sewers and the like.

It will ,be readily understood that minor (changes in the size, f OIIH and construction of the various parts ofmy improved lining ;-can be anade and substituted for-those hercin shown and described, without departing (from the spiritof any invention, the scope of whichis set forth in the appended claim.

I claim: The :hereindescribed lining for shafts, which lining is laid in courses and each :course comprising a pair of side slabs and -a pair of end slabs, portions of each side ,slab on the inner face thereof being cut away immediately adjacent to their ends to form vertically disposed shoulders which are inset with respect to the end faces of said side slabs, substantially rectangular blocksprojectingoutwardly from the lower portions of the ends of each side slab, the upper faces of which blocks constitute horizontally disposed shoulders, and a pair of vend slabs, the inner corners at the ends of which are adapted to bear against the verticallydis-posed inset shoulders, vertically disposed ribs formed integral with the inner :faces of the end slabs, the outer end faces of which ribs are inset with respect to the nd faces of said end slabs and which faces form vertically disposed shoulders which bear directly against the inner faces of the side slabs adjacent to the vertically disposed shoulders thereon, and substantially rectangu-lar blocks projecting outwardly ALLEN B. DOWVELL.

five cents each, by addressing the Commissioner of Batents,

Washington; I); 0." 

